Sporadic "Survey return zero cross section" errors

Hi Veit,

Could you try with 1.4.8?
We solve a similar problem in 1.4.7, so I hope that this is exactly the same.

Cheers,

Olivier

On Jul 30, 2012, at 10:26 AM, Veit Scharf wrote:

> New question #204558 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/204558
>
> Dear MadGraph team,
>
> I generated process cards for the W+2photon final state. For technical reasons I need to run the event generation in batches of ~5000 events and therefore I use the multi_run utility.
>
> After 2 - 10 jobs the scripts exists with the error message below. The reasons given don't seem applicable to my case, as it works most of the time. Probably I'm just unlucky and the survey stops to early for a non-zero cross section to appear.
>
> Do you have any suggestions how to get around this?
>
> Thanks for your time, cheers
>
> Veit
>
> #************************************************************
> #* MadGraph/MadEvent 5 *
> #* *
> #* * * *
> #* * * * * *
> #* * * * * 5 * * * * *
> #* * * * * *
> #* * * *
> #* *
> #* *
> #* VERSION 5.1.4.6 *
> #* *
> #* The MadGraph Development Team - Please visit us at *
> #* https://server06.fynu.ucl.ac.be/projects/madgraph *
> #* *
> #************************************************************
> #* *
> #* Command File for MadEvent *
> #* *
> #* run as ./bin/madevent.py filename *
> #* *
> #************************************************************
> multi_run 80 run_03
> Traceback (most recent call last):
> File "/data/tractor/x02/users/vscharf/MadEvent/118615/bin/internal/extended_cmd.py", line 549, in onecmd
> return cmd.Cmd.onecmd(self, line)
> File "/data/tractor/x01/atlas/athena/17.0.4/sw/lcg/external/Python/2.6.5/i686-slc5-gcc43-opt/lib/python2.6/cmd.py", line 219, in onecmd
> return func(arg)
> File "/data/tractor/x02/users/vscharf/MadEvent/118615/bin/internal/madevent_interface.py", line 1904, in do_multi_run
> self.exec_cmd('generate_events %s_%s -f' % (main_name, i), postcmd=False)
> File "/data/tractor/x02/users/vscharf/MadEvent/118615/bin/internal/extended_cmd.py", line 587, in exec_cmd
> stop = cmd.Cmd.onecmd(current_interface, line)
> File "/data/tractor/x01/atlas/athena/17.0.4/sw/lcg/external/Python/2.6.5/i686-slc5-gcc43-opt/lib/python2.6/cmd.py", line 219, in onecmd
> return func(arg)
> File "/data/tractor/x02/users/vscharf/MadEvent/118615/bin/internal/madevent_interface.py", line 1720, in do_generate_events
> Please check/correct your param_card and/or your run_card.''')
> MadGraph5Error: Survey return zero cross section.
> Typical reasons are the following:
> 1) A massive s-channel particle has a width set to zero.
> 2) The pdf are zero for at least one of the initial state particles.
> 3) The cuts are too strong.
> Please check/correct your param_card and/or your run_card.
> Value of current Options:
> web_browser : None
> text_editor : None
> pythia-pgs_path :
> td_path :
> delphes_path :
> cluster_type : pbs
> madanalysis_path : /data/tractor/x02/users/vscharf/MadEvent/MadAnalysis
> cluster_queue : Eternal
> fortran_compiler : None
> nb_core : 4
> exrootanalysis_path :
> eps_viewer : None
> timeout : 20
> automatic_html_opening : False
> cluster_mode : 1
> pythia8_path :
> run_mode : 1
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.